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Finding the Fourth Proportional to 280.64, 387.28 and 187.52

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Solution

The fourth proportional to 280.64, 387.28 and 187.52 is: 258.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.64 : 387.28 = 187.52 : x
  2. Step 2: Convert to fraction form
    280.64/387.28 = 187.52/x
  3. Step 3: Cross multiply
    280.64x = 387.28 × 187.52
  4. Step 4: Simplify right side
    280.64x = 72,622.75
  5. Step 5: Solve for x
    x = 72,622.75/280.64
  6. Step 6: Final answer
    x = 258.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.